Added the HillsDemo.
Copied the VertexArray helper from Pioneer.
Added vertical movement and WADS support to Avatar class.
Started hacking
Moved HMD warping shader to a shader file.
Updated the frag and vert PosCol shader to GLSL shader 330.
Started removing legacy OpenGL code.
Merge branch 'ShaderUpdate' of github.com:fluffyfreak/OculusOpenGLSDL2

Conflicts:
	Common/Avatar.cpp
Update Hills to use newer style shaders.